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National Historic Landmarks are sites, structures, buildings, districts, and objects that have been officially recognized by the United States government for their historical significance. These landmarks represent important events, people, or places in American history and are designated as such to ensure their preservation for future generations. They may include a wide range of properties, from homes of famous individuals to battlefields, monuments, and other culturally or historically significant sites. The National Historic Landmark designation is the highest recognition given to properties by the federal government for their importance to the nation's heritage.